Update mini_chromium to 31e989ac0b03d50ebe71bfa13417c7f8b66db1b8.
Update mini_chromium to 31e989ac0b03d50ebe71bfa13417c7f8b66db1b8.

cbbdc1b965ec  Fix include guards in base/atomicops*
8f3fade515f6  Clean up -Wunused-parameter warnings reachable by Crashpad
              clients
31e989ac0b03  Declare string16 traits’ move() correctly

TBR=scottmg@chromium.org

Review URL: https://codereview.chromium.org/1021363002

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